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Through theoretical analysis, simulation test and practice, the law of a fracture’sinfluence on hard top coal press cracking was studied. The study focused on the relationbetween fracture and coal strength, top coal caving ability and work face layout. Based onthe investigation of the fracture system, the control of press cracking was achieved bymatching working face to fracture orientation to improve top-coal caving ability and recovery. The matching principle was pointed out: The top-coal caving working face should beperpendicular to or obliquely cross the primary fracture at a large angle, and cross thesecondary fracture at a small angle. The rational match can increase the recovery ratio oftop-coal and avoid rib spalling. The application of control technology on hard top coalpress cracking was introduced at the Iongwall top-coal caving face.
Through theoretical analysis, simulation test and practice, the law of a fracture ’sinfluence on hard top coal press cracking was studied. The study focused on the relation between fracture and coal strength, top coal caving ability and work face layout. Based on the investigation of the fracture system, the control of press cracking was achieved bymatching working face to fracture orientation to improve top-coal caving ability and recovery. The matching principle was pointed out: The top-coal caving working face should beperpendicular to or obliquely cross the primary fracture at a large angle, and cross thesecondary fracture at a small angle. The rational match can increase the recovery ratio oftop-coal and avoid rib spalling. The application of control technology on hard top coalpress cracking was introduced at the Iongwall top-coal caving face.